Dobbs, 35, was picked up mid-season after being released by the Marlins. He has largely struggled in a limited bench role, and owns a .171/.186/.195 line through 43 plate appearances on the year. Over parts of 11 seasons in the bigs, Dobbs has slashed .261/.306/.386 over 2,272 plate appearances.

Hill is a 25-year-old righty who was taken in the sixth round of the 2011 draft. He has risen steadily through the system, and currently owns a 1.92 ERA with 6.2 K/9 against just 0.9 BB/9 through 93 2/3 frames in his first extended time at Triple-A. Though he has worked as a starter in the minors, Hill will presumably slot into the Nationals pen for his first MLB action.